DateTime d = DateTime.Now.AddSeconds(100); // 添加100秒;
DateTime d = DateTime.Now.AddSeconds(-100); // 减少100秒。
https://www.cnblogs.com/dekevin/p/4551843.html
https://blog.csdn.net/zj735539703/article/details/45845697
DateTime d = DateTime.Now.AddSeconds(100); // 添加100秒;
DateTime d = DateTime.Now.AddSeconds(-100); // 减少100秒。
https://www.cnblogs.com/dekevin/p/4551843.html
https://blog.csdn.net/zj735539703/article/details/45845697